docs: def ssh_authorized_keys_lines(application_name, user=None):
      """Return contents of authorized_keys file for given application.
  
      :param application_name: Name of application eg nova-compute-something
      :type application_name: str
      :param user: The user that the ssh asserts are for.
      :type user: str
      """
      authorized_keys_list = []
  
      with open(authorized_keys(application_name, user)) as keys:
          for authkey_line in keys:
              if authkey_line.rstrip():
                  authorized_keys_list.append(authkey_line.rstrip())
      return(authorized_keys_list)